Chunks on the corner of the rendering distance are not synchronized between client and server for the terrain

Did this affect 1.21.3? Because in a singleplayer-world in cannot reproduce it. Ore is it only relevant for multiplayer?

it affects the “Singleplayer” mode, and it affects Minecraft 1.21.3

Ok. I want to start a new world with 1.21.3. Is this bug only a „optical“ thing or does it affect things that happen really in the chunks? Can blocks or items get lost in the process?

It's a visual bug